Uguru Island
This captivating dive spot is frequently visited by an array of impressive migratory marine species, including bluefin tuna, large yellowtail, yellowtail, and bigeye trevally. In addition, fortunate divers may encounter majestic creatures such as manta rays and hammerhead sharks, and even stand a good chance of observing sea turtles. For enthusiasts of macro diving, there is a designated area where one can admire the enchanting black-and-white lily goby, kudagombe, blue-and-white snapper, and red-and-white crab.
For those seeking an extraordinary diving experience in Japan, Uguru Island is an ideal choice. With its remarkable visibility of 13 meters, maximum depth of 20 meters, and advanced diver level recommendation, this captivating site promises unforgettable underwater explorations. The island's close proximity to attractions like the 剣神社跡 (Kengensha Site) in Okinoshimacho-Ugurushima, Sukumo, Kochi Prefecture, further enhances the appeal of this pristine dive location.
Diving Conditions Score for Uguru Island
Good diving conditions!
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Uguru Island
Depth
20m
Visibility
13m
Experience Level
Weather Conditions for Uguru Island
Wave Height
0.7m
Wind Speed
9.2 m/s
Water Temp
24.1°C
Visibility
19.84km
Cloud Cover
42%
Wave Period
7.6s
Air Temperature
20.7°C
Precipitation
0 mm
Dive Score Chart for Uguru Island
Best time to dive: 13:00 with score 7.487372486772487/10. Water conditions: Waves 0.8m, Wind 7.3 m/s.Best night dive time: 3:00 with score 6.311566666666667/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Optimal diving conditions at Uguru Island are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.
Score: 7.5/10
Waves: 0.8m (6.3s), Wind: 7.3 m/s
Score: 6.3/10
Waves: 1.1m, Wind: 36.9 m/s
Seasonal Analysis for Uguru IslandAlpha
Historical patterns and best seasons for diving at Uguru Island
The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.
Monthly Dive Score Analysis - Seasonal Diving Conditions
Higher values indicate better diving conditions
Seasonal DiveScore Chart
This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.
Higher values indicate better diving conditions
Best Season for Uguru Island
Winter
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Uguru Island
Ideal Conditions for Uguru Island
Water Temp
23.3°C / 73.9°F
June
Visibility
20.1m / 65.9ft
October
Wave Height
0.2m / 0.7ft
January
Wave Period
8.0s
January
Seasonal Insights for Uguru Island
Uguru Island shows typical northern hemisphere patterns with June being the warmest month (23.3°C) and December the coldest (19.3°C). The calmest conditions typically occur in January with average wave heights of 0.2m and wave periods of 8.0s. The most comfortable wave conditions are in January with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). January is usually the driest month with 0.0mm of precipitation. For beginners, the best time to visit would be during January to March, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.
Last updated: 1 min. ago - Jun 22, 2026